CHAMP satellite and relatively densely spaced ground-based data measured over southern Africa between 2005 and 2010 are combined in a new regional, harmonic spline based, core field model. This new SACFM-2 model is compared to the regional SARM model, which is based only on satellite data, and the global CHAOS-6 model. The results agree well in the vertical (Z) component, with somewhat larger d...

This paper comparatively examines long-term variations in the thermospheres of Mars and Earth, from the solar maximum of 2002-2003 to the deep solar minimum of 2009-2010. Data employed include densities and exosphere temperatures derived from orbital drag analyses of the Mars Odyssey (MO) satellite for Mars, and accelerometer measurements on the CHAMP satellite for Earth. Derivation of thermosp...

[1] The current satellite magnetic missions offer new opportunities to determine the electrical conductivity of the Earth. However, satellites are nearly stationary in local time and therefore sample the inducing and induced fields quite differently than geomagnetic observatories, which rotate with the Earth. We show that estimates of induction transfer functions obtained from CHAMP magnetic da...

10.30 Introduction – Richard Holme 10.35 The Swarm Magnetic Mission, Roger Haagmans, ESA 11.00 Achievements in Characterising Ionospheric and Magnetospheric Fields, Hermann Lühr, GFZ Potsdam. 11.30 Modelling the recent geomagnetic field using satellite and ground magnetic observations – lessons learned from Ørsted and CHAMP and prospects for SWARM, Nils Olsen, DTU Space, Copenhagen. 12.00 Oppor...

Regular magnetic daily quiet time (Sq) variations in total intensity of about 30 nT amplitude are determined in Universal Time (UT) from satellite magnetic field measurements. The CHAMP satellite traverses all hours of local time in 132 days and the Sq variations in total intensity are therefore calculated as an average over the 132 days for each hour of UT. Results are compared with the Sq dai...

First results from the GPS radio occultation experiment aboard the German CHAMP satellite are presented. The agreement between observed temperature profiles in the upper troposphere and the lower stratosphere and temperature profiles obtained from meteorological analyses is found to be below 1 K. The data processing and analysis system (operated by GeoForschungsZentrum Potsdam) has been success...